eat light:

so if you had gotten rid of him before, what would be different? Would he still have cancer? Thoughts aren't as damaging as actions. The important thing is that you've spent your time and resources to give this animal a home for the last 14 years. Jester probably couldn't ask for more. He sounds like a relative, the ones whom you wouldn't pick, but get used to eventually.
Sorry to hear about Jester :(